Browse Prior Art Database

Read/Write Head for Magneto-Optic Disk

IP.com Disclosure Number: IPCOM000038631D
Original Publication Date: 1987-Feb-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Baasch, HJ: AUTHOR [+3]

Abstract

Described herein is a magneto-optic disk read/write head featuring an electromagnetic coil for writing which is located at the tip of the optical mount adjacent the focus point for the optics of the head. This configuration allows a rapid or high frequency switching of the field produced by the coil. This in turn permits single-pass writing operations on a magneto-optic disk. In Fig. 1, the read/write head is illustrated with a coil 10 mounted on the face 12 of supporting cone 14 mounted on the optical carrier element 16 of the head. Electrical contact to the coil is through electrodes 18 and 20. The structure of the head is shown in more detail in Fig. 2, which is a cut-away illustrating the objective lens assembly containing lenses 22 and 24 in carrier 16.

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Read/Write Head for Magneto-Optic Disk

Described herein is a magneto-optic disk read/write head featuring an electromagnetic coil for writing which is located at the tip of the optical mount adjacent the focus point for the optics of the head. This configuration allows a rapid or high frequency switching of the field produced by the coil. This in turn permits single-pass writing operations on a magneto-optic disk. In Fig. 1, the read/write head is illustrated with a coil 10 mounted on the face 12 of supporting cone 14 mounted on the optical carrier element 16 of the head. Electrical contact to the coil is through electrodes 18 and 20. The structure of the head is shown in more detail in Fig. 2, which is a cut-away illustrating the objective lens assembly containing lenses 22 and 24 in carrier 16. The objective lens assembly focuses the beam of light at the surface of the media 26. The face 12 of the read/write head is approximately 25 microns from the surface of the media; this allows space for the coil 10 which at its nearest point to the media is approximately 5 microns. To write on the media, the energy in the light beam must be sufficient to heat the media while a field from coil 10 orients magnetic particles to a given polarization in the media. The orientation of particles is vertical in this recording operation. Because of the size

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of coil 10 and its close proximity to the surface of the media, the coil is capable of very rapid switching be...